酒石酸鉀鈉（PST）對納濾處理重金屬廢水的強化效果

更新時間：2014-07-15 10:49 來源：環境工程學報作者: 閱讀：3131

中文摘要:

以酒石酸鉀鈉（PST）為絡合劑，分別選取Cd、Zn、As和Pb 4種金屬廢水，探索絡合納濾工藝對金屬離子去除率和膜通量的強化效果，測定納濾膜表面接觸角以表征膜通量變化規律，并研究了壓力、金屬濃度和溶液pH參數對絡合納濾過程的影響。結果表明，PST對4種金屬去除的強化效果存在相似規律，分別有一個最佳PST添加濃度。隨PST濃度的增加，金屬離子去除率先增大后減小，而膜通量一直增大。研究發現，納濾膜表面接觸角與膜通量呈穩定的反比例關系，與金屬離子種類和PST添加量無關。隨著操作壓力的增大，膜通量線性增加，去除率基本不變；金屬離子濃度的增加對膜通量影響不大，金屬去除率略有上升；pH在4~5之間變化時，As去除中膜通量和去除率均有所升高，而Cd、Zn和Pb 3種溶液處理效果基本不受pH影響。

英文摘要:

Potassium sodium tartrate (PST) was chosen as the complexing agent to study the enhanced effects of nanofiltration for the removal of cadmium,zinc,arsenic and lead from wastewater.Contact angles of membrane surface were measured to describe the change of flux.The effects of applied pressure,feed concentration and pH on metal ion separation were examined.The results showed the four metals had quite similar experimental results,and that the rejection increased and then decreased with increasing PST concentration.Unexpectedly,the permeate flux was found to increase over the entire range,which was quite different from what was reported in previous complexation studies.β was inversely proportional to permeate flux no matter what the metal ions or PST addition were.Increasing the operating pressure did not improve metal rejection,but the flux increased linearly.The rejection coefficient increased slightly with increasing feed concentrations,while the flux remained almost constant in the range.The flux and the rejection of As both increased when pH increased from 4 to 5,but the removal results of Cd,Zn and Pb weren't affected by pH.

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